Bleeding brakes, no fluid to the rears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

19GMC63 · 02-24-2007, 07:39 PM

Ok, so yesterday I replaced a rear brake line since the PO snipped the old rusty one off because it had a hole in it. When I took the old one off, I got a dribble of fluid.
Well, I filled the rear reservoir, and began to bleed the rear brakes, and got nothing, no air or fluid. I tried pressure bleeding and the traditional two man bleeding and the bleeders are clean. I tried holding the metering pin in on the prop. valve with no luck, still no fluid to the rear.
Oh, and the front brakes (discs) work fine.

I'm stumped.

thanks in advance for the help/

*Shane* · 02-24-2007, 08:01 PM

If the rear reservoir on the mastercylinder was completely dry, then you might try bench bleeding the master cylinder.

That's the only thing that comes to mind ... anyone else have any ideas?

cdowns · 02-24-2007, 09:44 PM

you need to center the pin on the end of the proportioning valve to get fluid to the rear system

19GMC63 · 02-24-2007, 09:50 PM

what do you mean by centering the pin?

All I tried on the pin was pushing on it to keep it from coming out when the brakes were applied.

smbrouss70 · 02-25-2007, 05:11 PM

I've had the rubber brake line that goes from the frame to the axle collapse on the inside and wouldn't let anything through it. It looked fine on the outside. Just a thought.

cableguy0 · 02-25-2007, 06:14 PM

you probably need to bleed the master cylinder itself. pump the brakes and have a buddy hold the pedal then crack the line loose that goes to the rear.put a lot of rags around because this will make a mess. once you have the master cylinder bled it will allow fluid to go through the rest of the rear lines

19GMC63 · 02-25-2007, 06:43 PM

thanks for the replies...
I will try and bleed the master cylinder like you say, I know its better to do a true bench bleed since plunger doesn't max out, but I don't feel like takin it off.

thanks again.

02-24-2007, 07:39 PM	#1
19GMC63 Registered User Join Date: Nov 2006 Location: Nashville, TN Posts: 1,510	Bleeding brakes, no fluid to the rears Ok, so yesterday I replaced a rear brake line since the PO snipped the old rusty one off because it had a hole in it. When I took the old one off, I got a dribble of fluid. Well, I filled the rear reservoir, and began to bleed the rear brakes, and got nothing, no air or fluid. I tried pressure bleeding and the traditional two man bleeding and the bleeders are clean. I tried holding the metering pin in on the prop. valve with no luck, still no fluid to the rear. Oh, and the front brakes (discs) work fine. I'm stumped. thanks in advance for the help/ Last edited by 19GMC63; 02-24-2007 at 07:40 PM.

02-24-2007, 08:01 PM	#2
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Bleeding brakes, no fluid to the rears If the rear reservoir on the mastercylinder was completely dry, then you might try bench bleeding the master cylinder. That's the only thing that comes to mind ... anyone else have any ideas?

02-24-2007, 09:44 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Bleeding brakes, no fluid to the rears you need to center the pin on the end of the proportioning valve to get fluid to the rear system __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

02-24-2007, 09:50 PM	#4
19GMC63 Registered User Join Date: Nov 2006 Location: Nashville, TN Posts: 1,510	Re: Bleeding brakes, no fluid to the rears what do you mean by centering the pin? All I tried on the pin was pushing on it to keep it from coming out when the brakes were applied.

02-25-2007, 05:11 PM	#5
smbrouss70 Registered User Join Date: Sep 2003 Location: Rayne, LA Posts: 2,782	Re: Bleeding brakes, no fluid to the rears I've had the rubber brake line that goes from the frame to the axle collapse on the inside and wouldn't let anything through it. It looked fine on the outside. Just a thought. __________________ Steven "If dogs don't go to heaven, when I die I want to go wherever they went." -- Will Rogers R.I.P. Oscar R.I.P. Ratchet 1967 Pontiac GTO - Dad was the Original Owner 1970 Chevy 2wd SWB "Oscar's Truck" 1970 Chevy 2wd Blazer "Ratchet's Blazer" 2013 Chevy 2500HD Crew Cab Duramax/Allison Z71 LTZ "Brown Sugar" 2017 Chevy Suburban "BDB" 2020 Chevy Blazer Premier "Foxy" Member of Louisiana Classic Truck Club (LCTC) Shop Build

02-25-2007, 06:14 PM	#6
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Bleeding brakes, no fluid to the rears you probably need to bleed the master cylinder itself. pump the brakes and have a buddy hold the pedal then crack the line loose that goes to the rear.put a lot of rags around because this will make a mess. once you have the master cylinder bled it will allow fluid to go through the rest of the rear lines __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

02-25-2007, 06:43 PM	#7
19GMC63 Registered User Join Date: Nov 2006 Location: Nashville, TN Posts: 1,510	Re: Bleeding brakes, no fluid to the rears thanks for the replies... I will try and bleed the master cylinder like you say, I know its better to do a true bench bleed since plunger doesn't max out, but I don't feel like takin it off. thanks again.



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